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Abstract

This circuit provides multiple, individually regulated voltages of positive and negative polarities. The basic concept is to charge an inductor from the available voltage source and then to commutate the inductor's energy to the various outputs.

Country

United States

Language

English (United States)

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Universal Commutating Regulator

This circuit provides multiple, individually regulated voltages of positive and
negative polarities. The basic concept is to charge an inductor from the available
voltage source and then to commutate the inductor's energy to the various
outputs.

Inductor L is charged with energy from a source E when transistors Q1 and
Q2 are turned on. Then, by turning off transistor Q1 while leaving Q2 on, point X
will go negative due to the inductive kick of L. By turning on Q3, capacitor C1
can be charged to some negative value. The length of time that Q3 is on will
determine the voltage to which C1 will charge (V1). The control circuit senses V1
and turns off Q3 when C1 is charged to the desired level. The control then turns
on Q1 again to recharge L (Q2 still on). Once the inductor is recharged, Q1 is
turned off and Q4 turned on so that the inductor now charges C2. Thus, both
negative output capacitors will be charged.

Similarly, by turning off Q2 (with Q1 on) after charging the inductor, and then
turning on Q5, C3 will be charged by the inductor through Q1 and Q5. Likewise,
C4 is charged by turning on Q1 and Q6. Thus, both positive output capacitors
may be charged.

The energy stored in L per cycle is:

(Image Omitted)

It is not necessary that the inductor current drop to zero before recharging: in
fact, lower peak currents will result if it does not.